太陽フレア・ CME と宇宙天気Solar Flares/CMEs and Space Weather

浅井歩 (Ayumi Asai)1 、下条圭美 1 、

石井貴子 2 、黒河宏企 2 、柴田一成 2

1: 国立天文台野辺山、 2: 京大理

発生源としての太陽The Sun as a Source

• Active phenomena on the solar surface (flares/CMEs) work as sources of the outbreaks.

• The understandings of the generation mechanisms are important.

フレア･CME

伝播

影響

影響 影響

影響

擾乱

太陽フレア･ CMESolar Flare / CME

All of these are physically the same phenomena. They are different from each other on one point that they are observed in different aspects.

磁気リコネクションMagnetic Reconnection

• well explains observed phenomena

• phenomenologically succeeded

(Carmichael 1964; Sturrock 1966; Hirayama 1974; Kopp-Pneuman 1976)

• still needs to be checked quantitatively and qualitatively

プラズモイド噴出Plasmoid Ejections

• The combination of SXR ejections and HXR bursts has been observed

(e.g. Ohyama & Shibata 1997)

• Plasmoids play an important role in the reconnection process

プラズモイド噴出Plasmoid Ejections

• Multiple plasmoid ejections and correlation with HXR emissions

(Takasaki et al. 2005?)

②

⑦

⑥

④

③

①

①②③ ④ ⑥ ⑦

pre-eruption

During eruption

photosphere

Initial amount=N

Definition of

プロミネンス噴出Prominence Eruptions

• gravity force and magnetic pressure work effectively for prominence ejections

(Morimoto & Kurokawa 2003a, b)

CMEs• Strong correlation between

CMEs and prominences/plasmoids

• Similar relation between CME and SXR emission

Zhang et al. (2001)

CMEs• MHD simulation

direct comparison with observation(Shiota et al. 2005, Chen & Shibata 2001)

フレアリボンFlare Ribbons

Hflare ribbons

• The evolution of flare ribbons implies successive reconnection

also implies of the strength of the energy release (e.g. Asai et al. 2004)

リコネクションレートとポインティングフラックス

An HXR burst occurred on the slit (05:19 UT).

粒子加速Particle Acceleration

• Site? Amount?Mechanism?

Masuda et al. (1994)Aschwanden et al. (1996)

まとめSummary

• Active phenomena on the solar surface (flares/CMEs) work as sources of the outbreaks.

• The understandings of the generation mechanisms are important.

活動領域の成長Evolution of Active Region

2003/10/24 2003/10/25 2003/10/26 2003/10/27 2003/10/28 2003/10/29 2003/10/30 2003/10/31 2003/11/01 2003/11/02

2003/11/03

NOAA10488

NOAA10486

2003/10/28

NOAA10488

NOAA10486